Senior Systems Administrator

Leidos has an exciting and rewarding opportunity for a Senior Systems Administrator to work independently with minimal supervision providing systems administration for the Infrastructure and Deactivation & Remediation contractors at the DOE Portsmouth (Piketon, Ohio) site. The position will be part of an IT team responsible for the design, deployment, maintenance, configuration management, monitoring and troubleshooting of the IT infrastructure.

 

Primary Responsibilities:

 

• Perform daily system administration, operation and maintenance support activities in support of a physical and virtual environment.
• Provide primary support and management of the IT server infrastructure and hosted systems, focusing on areas like Active Directory, permissions, storage, Group Policy, etc.
• Support first-tier technical staff with troubleshooting and the resolution of more complex issues related to software tools, applications, databases, and system access.
• Analyze and resolve hardware and software problems for end users, with primary emphasis on server-related issues.
• Support System Administration of primary Omnissa/VMWare platforms across the site, among other technologies
• Works with hardware/software vendors to analyze, troubleshoot and resolve issues. 
• Recommend hardware and software solutions to meet end user and IT needs.
• Support Cyber Security compliance and audit preparation in coordination with the Cyber Security Team.
• Consults with internal departments to identify customer needs and include into both operational and project objectives.
• Remain conversant with the industry’s computer security technology and practices with technical skills and applicable experience with related technologies.
• Define and document best practices, technical guides and support procedures
• Interact with cross functional project teams including Software Development, Helpdesk, User Support, Cyber Security, Software Quality Assurance, End-Users and Oversight.
• Participate in the creation and ongoing maintenance of documentation to ensure clear, concise and accurate information is readily available to assist with incident resolution
• Remediate security vulnerabilities
• Communicates effectively via Microsoft Teams, email and phone.

 

Basic Qualifications:

 

• Bachelor’s degree in Computer Science, Information Technology, or related field with 4–8 years of relevant experience; OR a Master’s degree with 2–6 years of experience.
• Ability to obtain and maintain a DOE Q security clearance.
• Demonstrated ability to work independently with minimal supervision in a fast-paced environment with competing priorities.
• Exceptional analytical, technical, and problem-solving skills with proven success in enterprise systems administration.
• Strong verbal and written communication skills, with the ability to articulate complex technical concepts to diverse audiences.
• Experience with Microsoft Windows and Server Operating Systems and/or Oracle, RHEL, and Linux Operating Systems.
• Hands-on experience in maintenance, operation, and troubleshooting of enterprise systems and networks.
• Solid operational knowledge of Microsoft and/or Linux platforms, as well as network equipment, topology, and architectures.
• Ability to read and execute complex software installation, upgrade, and infrastructure deployment instructions.
• Strong interpersonal skills and demonstrated ability to collaborate effectively across teams.

 

Preferred Qualifications:

 

• Prior DOE site experience.
• Active DOE security clearance.
• Industry-recognized certifications such as MCP, MCSE, CCNA, CCNP, Network+, VMware VCP, or related credentials.
• Experience administering and managing shared enterprise resources.

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Original Posting:

October 7, 2026

Pay Range:

Pay Range $73,450.00 - $132,775.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.